If one person licks another's arse, they try very hard to please the second person or say nice things about them. Note: `Arse' is a very rude word for a person's bottom. I don't feel bad about slagging Jim off since everybody else is licking his arse. Note: This expression is used disapprovingly. Note: You can call someone who does this an arselicker. The activity of doing this is called arselicking. Everett, you're not the arselicker everybody thinks you are. Meanwhile, we were down on our hands and knees arselicking all day, because if you upset somebody you had nowhere else to go.